Question

The weight of a ma is four times the weight of his child. Write an equation in two variables for this situation.

Answer 1

let the weight of the ma be x
and eight of the child be y

as per the sum,
x=4y
x-4y+0=0.

hope it helps ...

Answer 2

let man's weight is x and his child's weight is y
now according to question
man's weight=4 x child's weight
x=4y
hence x-4y=0